/*
 *  Copyright 2009 Johan Maasing.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *  under the License.
 */
package com.google.code.pj2r.resources;

import com.google.code.pj2r.Marshaller;
import com.google.code.pj2r.MarshallingException;

import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;

/**
 * A meta-marshaller that delegates to a list of other marshallers.
 * @author Johan Maasing
 */
public class MultiMarshaller implements Marshaller {

	private final List marshallers;

	/**
	 * Create a new multi-marshaller.
	 * @param marshallers The lsit of marshallers to delegate marshalling to. May not be null or empty.
	 */
	public MultiMarshaller(final List marshallers) {
		if (marshallers == null) {
			throw new IllegalArgumentException("List of marshallers may not be null");
		}
		if (marshallers.size() < 1) {
			throw new IllegalArgumentException("List of marshallers may not be empty");
		}
		this.marshallers = marshallers;
	}

	public void marshal(HttpServletRequest request, Object result) throws MarshallingException {
		for (Iterator i = marshallers.iterator(); i.hasNext();) {
            Marshaller marshaller = (Marshaller) i.next();
			marshaller.marshal(request, result);
		}
	}
}
